| Applies To | |||
| Product(s): | RAM Connection | ||
| Version(s): | Any | ||
| Area: | Design |
How is Mpl and Mstrip Calculated?
The design procedure for base plate design in RAM Connection is based on AISC Design Guide 1. The Design Guide includes some design examples that will clarify how these parameters are calculated.
The equations used to calculate the plate bending moment in the "Flexural Yielding (Bearing Interface)" check are discussed in Section 3.3.2 of the Design Guide.
The strip moment in the "Flexural Yielding (Tension Interface)" check is calculated assuming the tensile loads in the anchors generate one-way bending in the base plate about assumed bending lines. The location of the bending lines depends on whether the anchors are placed inside or outside the column flanges. See Figure 3.1.1(b) and Figure 4.5.2 in the Design Guide. The program assumes a 45 degree load distribution from the anchor to the bending line to determine the width of the bending strip.
When designing a base plate connection, the ACI 318 Appendix D checks are not completed.
Since the ACI Appendix D checks are based on ultimate limit state design, RAM Connection will only complete the ACI Appendix D checks if LRFD is selected for the design method. See frequently asked question above for information on changing the design method.
When shear lugs are included in the base plate connection, the shear is assumed to be resisted entirely by the shear lug and the shear demand in the anchors will be 0.
Why doesn't the program report the Anchor anchor pullout in my file?
The Anchor pullout design for US design codes is limited to LRFD methods. When performing ASD design of a base plate report simply indicates:
NOTES
Anchors only designed for LRFD code
How are biaxial baseplates analyzed?
A linear model is used for the contact stresses calculation between a steel base plate and a concrete foundation. Read the full paper on this topic HERE.
See Also
Troubleshooting Errors when Assigning Connections
RAM Connection Stalls When Assigning Base Plate Connection
[[The Solution Was Not Found For Load Case Error - Base Plate Design]]
Structural Product TechNotes And FAQs